Source Code : void unset ( mixed var [, mixed var [, mixed ...]] )

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void unset ( mixed var [, mixed var [, mixed ...]] )

 
The unset( ) function deletes a variable so that isset( ) will return false. Once deleted, you can recreate a variable later on in a script.
<?
    $name = "Paul";
    if (isset($name)) print "Name is set
";
    unset($name);
    if (isset($name)) print "Name is still set
";
?>

That would print out "Name is set", but not "Name is still set", because calling unset( ) has deleted the $name variable.
  
  

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